Photoluminescence and structural similarity of crystals with oxidefluoride stacking structure and oxyfluoride glass

Kenji Shinozaki, Sohei Sukenaga, Koji Ohara

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we developed a highly efficient photoluminescent glass from the design of a shortmedium range structure and the photoluminescence (PL) of a fluoroborate glass. We investigated PL and the structures of BaMgBO3F ceramics and the B2O3-added composition of glasses and glass-ceramics. The glass showed higher quantum yield (QY) than ceramic samples, i.e., the QY was 95 % for glass and 51 % for ceramics, by a 395 nm excitation. The glass can contain a large amount of emission centers with small concentration quenching, and 15 % Eu-doped glass exhibited higher PL intensity and QY than commercial Y2O3:Eu3+ phosphor. The origin of a high QY and small concentration quenching were investigated by the structural analysis. The glass structure was investigated using 19F- and 11B-magic-angle spinning nuclear magnetic resonance, extended X-ray absorption fine structure of Ba K-edge, and high-energy X-ray diffraction. Moreover, the glass structure was simulated by molecular dynamics. It was found that the glass had a structural similarity with BaMgBO3F crystal in the short-range order of B and Ba. The glass had a clear selectivity that B preferred to bind to O and Ba preferred to bind to F. The glass also exhibited unique medium-range ordering. Two types of BaBa displacements were observed, which could be attributed to in-plane and out-plane layered displacements of the corresponding crystal, with the stacking structure of oxidefluoride layers indicated by the radial distribution. The glass showed anion segregation, also similar to the layer-stacking structure of BaMgBO3F. This made the low phonon sites coordinated with F compatible with the asymmetric sites derived from the oxide network segregation, resulting in high PL efficiency. The study results can contribute to the use of rare-earth ion-doped glasses in various applications such as laser and optical amplification, white light emitting diode (LED) lighting, and sensing technologies.

Original languageEnglish
Pages (from-to)1030-1037
Number of pages8
JournalJournal of the Ceramic Society of Japan
Volume128
Issue number12
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Glass structure
  • Microsegregation
  • Oxyfluorides
  • PDF analysis
  • Photoluminescence

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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